US 12,081,937 B2
Sound emitting apparatus
Shinichi Kato, Hamamatsu (JP); and Yoshifumi Oizumi, Hamamatsu (JP)
Assigned to Yamaha Corporation, Hamamatsu (JP)
Filed by Yamaha Corporation, Hamamatsu (JP)
Filed on Apr. 29, 2022, as Appl. No. 17/733,193.
Application 17/733,193 is a continuation of application No. PCT/JP2020/040439, filed on Oct. 28, 2020.
Claims priority of application No. 2019-199229 (JP), filed on Oct. 31, 2019; and application No. 2019-199230 (JP), filed on Oct. 31, 2019.
Prior Publication US 2022/0264220 A1, Aug. 18, 2022
Int. Cl. H04R 1/28 (2006.01); H04R 1/02 (2006.01); H04R 1/32 (2006.01)
CPC H04R 1/2826 (2013.01) [H04R 1/025 (2013.01); H04R 1/026 (2013.01); H04R 1/288 (2013.01); H04R 1/323 (2013.01); H04R 2201/021 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A sound emitting apparatus comprising:
a speaker unit; and
an enclosure of the speaker unit having an aperture configuring a Helmholtz resonator, wherein a resonance frequency Fr of a Helmholtz resonator is set to be equal to or higher than a reproducible lower limit frequency of the speaker unit,
wherein a width A of the enclosure and a wavelength λ of a sound wave corresponding to the resonance frequency Fr satisfy the following formula (C):
A≥0.5λ.  (C).